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Fish Kill Now Reported At Davis Beach; Algae Might Be Culprit

Photo from Bernie Banull

The same algae bloom also killed marine wildlife at Philippe Park in Safety Harbor on Thursday morning.

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By MIKE SALINERO and CHRIS URSO

The Tampa Tribune

Published: July 31, 2008

Updated: 07/31/2008 06:05 pm

TAMPA - New fish kills were reported in Old Tampa Bay today, widening the death zone miles beyond the original kill reported at Courtney Campbell Parkway during the weekend.

The latest fish kill was reported at the mouth of Allen's Creek in Largo, roughly two miles south of the Causeway. Dead fish also were reported at Philippe Park in Safety Harbor, about three miles north of the causeway.

"The kill is continuing," said Theresa Cody, a research scientist with the state Fish and Wildlife Research Institute. "It tells me it's ongoing, but there is a lot of difference between Philippe Park and Allen's Creek, so I guess it's a pretty widespread problem."

Cody blamed low oxygen levels for the widespread kills. Water samples taken Wednesday and today revealed dissolved oxygen levels well below the danger level of 5 milligrams per liter.

Bernie Banull of Safety Harbor took pictures of dozens of dead and dying stingrays at Philippe Park as well as other struggling fish. He said mullet were swimming on top of the water and appeared to be gasping.

Institute researchers think an algae bloom is causing the low oxygen levels. Higher-than-normal amounts of algae called Rhizosolenia setigera and Pseudo-nitzschia are present in the bay. The algae produces oxygen when the sun is shining and uses oxygen at night.

Nitrates and phosphorus, carried into the bay by stormwater runoff, can fuel the algae blooms, and overcast skies can limit the amount of oxygen the algae produces in the day.

Scientists say red tide, an algae bloom that kills fish and causes respiratory distress in human, is not responsible for the fish kills. Water sampling last week showed no red tide cells in the bay.

Cody also said that high levels of bacteria, which caused authorities this week to close Ben T. Davis and Courtney Campbell Parkway beaches, are not responsible for the fish kills.

The first fish kill at the causeway was reported to institute officials Sunday. By the time research teams investigated on Monday, the fish had been dead too long to get fresh samples needed for necropsies.

Today, however, scientists were able to collect several stingrays, sea trout, drum and pinfish.

Necropsies performed today could determine what caused the kills.

"They were definitely behaving abnormally," Cody said. "Based on the on the water quality, the low dissolved oxygen, I would definitely say they're having problems breathing."

It could take two weeks to get the test results.

Carli Segelson, an institute spokeswoman, said it is not unusual for stingrays to be affected by the algae.

"This is a multispecies fish kill, and these stingrays were in the area at the time," Segelson said.

Dead pinfish, kingfish, sea trout and blue crabs also were found at the two locations.

Researcher Buddy Jaudon contributed to this report.

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